Last week, the FBI swooped in and arrested Danny Stephen Webb in the quiet Welsh village of Maenan.

Webb was the false name used by Daniel Andreas San Diego, while on the run for 21 years. He was an American man involved in two bombings in 2003. The FBI describes him as "an animal rights extremist" and a "terroristUsing violence or the threat of violence to create fear among a wide group of people. ". They offered $250,000 (£199,000) for information leading to his arrest.

Neighbours think San Diego was caught because he bought a house.

Disappearing requires constant attention. Yet we provide a data footprint every time we use a digital device. If we pay for something using a card the bank logs our details. Our phones track where we have been.

There are cameras everywhere, and in London, you are likely to be captured on CCTVShort for closed circuit television. Video camera used to monitor areas for security. up to 70 times a day.

Is it possible to hide today?

Yes! San Diego managed 21 years before he was caught. Someone with enough cunning could do the same or better.

No! Thanks to digital technology, we are all pretty much constantly under surveillance.